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Feb
16
comment Does everything in this world vibrate? Why?
the story, yes. Important to remember It is fiction.
Feb
16
comment Does everything in this world vibrate? Why?
For amusement - gwthomas.org/wyndham.htm - A John Wyndham sci-fi story on this exact topic :-)
Feb
16
comment Does everything in this world vibrate? Why?
Do you understand the underlying principles of atomic structure? And the vibration of atoms, rather than entire objects. Your follow-on regarding uncontrolled resonance amplification is just wrong. If you pump in enough power at the right frequency you can get vibration, yes, and you can knock down walls if you make them vibrate (battering ram, perhaps) but to make the atoms in a diamond all vibrate is a challenge, as they don't all vibrate at the same frequency - so how will you add power at al the required frequencies...?
Aug
6
comment What planets are visible to the naked eye from Mars?
Good answer. I like it. Thanks for the Uranus info - I'll update.
Aug
22
comment How far into space does one have to travel to see the entire sphere of earth?
The Earth's radius
May
16
comment Magnetic hot air balloon
Your updates still don't help. There is no way you can get the density below that of space. The rest of the items in there are all down to whatever device you use to heat the plasma, strength of field etc. so you can't even calculate how high it may be able to get to unless you make a large amount of assumptions.
Feb
2
comment Why am I not burned by a strong wind?
minor nitpick - 120mph winds are unlikely to pick up an adult. They are hard to walk in, but a constant 120mph wind is okay. Gusts, tornadoes etc are a whole different kettle of fish :-)
Sep
21
comment What really is the smallest “mass” or “object” in the universe?
'mass always seems to keep growing' - really? Please explain.
Sep
10
comment Validity of the holographic principle
Does this make sense in the context of a universe that has no boundary?
Jun
26
comment Is the universe we know just shaped due to time?
Always liked that game and the Devil's Tuning Fork - just wish they had been developed further.
May
12
comment Distance away from earth to see it as a full disk
Duplicate of this one from 2012: physics.stackexchange.com/q/25509/2498
May
10
comment What planets are visible to the naked eye from Mars?
You can actually see Europa from earth if you block out Jupiter with something. Tricky, but apparently doable - I haven't managed it, but have seen all four moons easily with cheap binoculars.
May
10
comment What planets are visible to the naked eye from Mars?
Doh - yes, moons:-) and yes, you can see them with the naked eye from earth - a few astronomers have reported sighting Callisto and Ganymede. Io and Europa are masked by Jupiter's glare.
May
3
comment How do whisky stones keep your drink cold?
Hang on - this definitely means whisky stones are better. We don't want whisky below zero degrees!
May
3
comment How do whisky stones keep your drink cold?
Graham, you don't have cold whisky, but you definitely want to make sure it isn't warm.
May
3
comment How do whisky stones keep your drink cold?
Interestingly: Soapstone appears to be renowned for its high Specific Heat Capacity: 0.98 J/gK - about 20% greater than other natural stone. It is also incredibly dense and non-porous, which is why it is chosen for whisky stones
May
3
comment How do whisky stones keep your drink cold?
I am delighted there is such a thing as DrinkHacker - it is in my favourites list now!
Apr
30
comment What's the surface area of a liquid? How does evaporation increase if the surface area of a liquid is increased?
Akanksha - did you mean to comment on your own answer to say it was excellent? I am guessing you meant it to go on one of the other ones. ..
Apr
30
comment How does the energy in a standing wave travel beyond a node?
Key thing is - energy does travel past nodes. Once you understand that, the rest is easy. See Brandon's comment above.
Apr
30
comment How does the energy in a standing wave travel beyond a node?
Remembering my laser optics course at university twenty-something years ago, I would say that skullsinthestars website has a lot of bad physics. Energy does travel past nodes, diffraction is not how dvd players work etc.